The Experts below are selected from a list of 152520 Experts worldwide ranked by ideXlab platform
Yaron Silberberg - One of the best experts on this subject based on the ideXlab platform.
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polarization control of multiply scattered light through random media by wavefront shaping
arXiv: Optics, 2012Co-Authors: Yefeng Guan, Ori Katz, Eran Small, Jianying Zhou, Yaron SilberbergAbstract:We show that the polarization state of coherent light propagating through an optically thick multiple-scattering medium, can be controlled by wavefront shaping, i.e. by controlling only the Spatial phase of the incoming field with a Spatial light modulator. Any polarization state of light at any Spatial Position behind the scattering medium can be attained with this technique. Thus, transforming the random medium to an arbitrary optical polarization component becomes possible.
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Polarization control of multiply scattered light through random media by wavefront shaping
Optics Letters, 2012Co-Authors: Yefeng Guan, Ori Katz, Eran Small, Jianying Zhou, Yaron SilberbergAbstract:We show that the polarization state of coherent light propagating through an optically thick multiple scattering medium can be controlled by wavefront shaping, that is, by controlling only the Spatial phase of the incoming field with a Spatial light modulator. Any polarization state of light at any Spatial Position behind the scattering medium can be attained with this technique. Thus, transforming the random medium to an arbitrary optical polarization component becomes possible.
Michael J Wiley - One of the best experts on this subject based on the ideXlab platform.
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influence of tributary Spatial Position on the structure of warmwater fish communities
Canadian Journal of Fisheries and Aquatic Sciences, 1992Co-Authors: Lewis L Osborne, Michael J WileyAbstract:We found a significant and positive relationship between fish species richness and four measures of stream size (drainage area, stream order, link magnitude, and downstream link) in three Illinois drainage basins. Downstream link (incorporating both stream size and size of stream at the next downstream confluence) explained the greatest portion of the variance. This suggests that downstream processes significantly influence the structure of fish communities inhabiting warmwater streams. Significantly higher numbers of fish species were collected from tributary streams (< 259 km2 drainage area) located lower in a drainage network and connected to a main channel system than from similarly sized streams located in the headwaters of a drainage network. The difference in species richness among station treatments was not due to a difference in the number of individuals collected among treatments. We were unable to accept or reject the hypothesis that differences in fish species richness were due to differences ...
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influence of tributary Spatial Position on the structure of warmwater fish communities
Canadian Journal of Fisheries and Aquatic Sciences, 1992Co-Authors: Lewis L Osborne, Michael J WileyAbstract:We found a significant and positive relationship between fish species richness and four measures of stream size (drainage area, stream order, link magnitude, and downstream link) in three Illinois ...
Yefeng Guan - One of the best experts on this subject based on the ideXlab platform.
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polarization control of multiply scattered light through random media by wavefront shaping
arXiv: Optics, 2012Co-Authors: Yefeng Guan, Ori Katz, Eran Small, Jianying Zhou, Yaron SilberbergAbstract:We show that the polarization state of coherent light propagating through an optically thick multiple-scattering medium, can be controlled by wavefront shaping, i.e. by controlling only the Spatial phase of the incoming field with a Spatial light modulator. Any polarization state of light at any Spatial Position behind the scattering medium can be attained with this technique. Thus, transforming the random medium to an arbitrary optical polarization component becomes possible.
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Polarization control of multiply scattered light through random media by wavefront shaping
Optics Letters, 2012Co-Authors: Yefeng Guan, Ori Katz, Eran Small, Jianying Zhou, Yaron SilberbergAbstract:We show that the polarization state of coherent light propagating through an optically thick multiple scattering medium can be controlled by wavefront shaping, that is, by controlling only the Spatial phase of the incoming field with a Spatial light modulator. Any polarization state of light at any Spatial Position behind the scattering medium can be attained with this technique. Thus, transforming the random medium to an arbitrary optical polarization component becomes possible.
Aman B Saleem - One of the best experts on this subject based on the ideXlab platform.
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coherent encoding of subjective Spatial Position in visual cortex and hippocampus
Nature, 2018Co-Authors: Aman B Saleem, Mika E Diamanti, Julien Fournier, Kenneth D Harris, Matteo CarandiniAbstract:A major role of vision is to guide navigation, and navigation is strongly driven by vision1–4. Indeed, the brain’s visual and navigational systems are known to interact5,6, and signals related to Position in the environment have been suggested to appear as early as in the visual cortex6,7. Here, to establish the nature of these signals, we recorded in the primary visual cortex (V1) and hippocampal area CA1 while mice traversed a corridor in virtual reality. The corridor contained identical visual landmarks in two Positions, so that a purely visual neuron would respond similarly at those Positions. Most V1 neurons, however, responded solely or more strongly to the landmarks in one Position rather than the other. This modulation of visual responses by Spatial location was not explained by factors such as running speed. To assess whether the modulation is related to navigational signals and to the animal’s subjective estimate of Position, we trained the mice to lick for a water reward upon reaching a reward zone in the corridor. Neuronal populations in both CA1 and V1 encoded the animal’s Position along the corridor, and the errors in their representations were correlated. Moreover, both representations reflected the animal’s subjective estimate of Position, inferred from the animal’s licks, better than its actual Position. When animals licked in a given location—whether correctly or incorrectly—neural populations in both V1 and CA1 placed the animal in the reward zone. We conclude that visual responses in V1 are controlled by navigational signals, which are coherent with those encoded in hippocampus and reflect the animal’s subjective Position. The presence of such navigational signals as early as a primary sensory area suggests that they permeate sensory processing in the cortex.
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coherent representations of subjective Spatial Position in primary visual cortex and hippocampus
bioRxiv, 2017Co-Authors: Aman B Saleem, Julien Fournier, Kenneth D Harris, Efthymia Diamanti, Matteo CarandiniAbstract:A major role of vision is to guide navigation, and navigation is strongly driven by vision. Indeed, the brain9s visual and navigational systems are known to interact, and signals related to Position in the environment have been suggested to appear as early as in visual cortex. To establish the nature of these signals we recorded in primary visual cortex (V1) and in the CA1 region of the hippocampus while mice traversed a corridor in virtual reality. The corridor contained identical visual landmarks in two Positions, so that a purely visual neuron would respond similarly in those Positions. Most V1 neurons, however, responded solely or more strongly to the landmarks in one Position. This modulation of visual responses by Spatial location was not explained by factors such as running speed. To assess whether the modulation is related to navigational signals and to the animal9s subjective estimate of Position, we trained the mice to lick for a water reward upon reaching a reward zone in the corridor. Neuronal populations in both CA1 and V1 encoded the animal9s Position along the corridor, and the errors in their representations were correlated. Moreover, both representations reflected the animal9s subjective estimate of Position, inferred from the animal9s licks, better than its actual Position. Indeed, when animals licked in a given location — whether correct or incorrect — neural populations in both V1 and CA1 placed the animal in the reward zone. We conclude that visual responses in V1 are tightly controlled by navigational signals, which are coherent with those encoded in hippocampus, and reflect the animal9s subjective Position in the environment. The presence of such navigational signals as early as in a primary sensory area suggests that these signals permeate sensory processing in the cortex.
Simon R Harris - One of the best experts on this subject based on the ideXlab platform.
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the almost sure population growth rate in branching brownian motion with a quadratic breeding potential
Statistics & Probability Letters, 2010Co-Authors: Julien Berestycki, Eric Brunet, J W Harris, Simon R HarrisAbstract:In this note we consider a branching Brownian motion (BBM) on R in which a particle at Spatial Position y splits into two at ratey 2 , where � > 0 is a constant. This is a critical breeding rate for BBM in the sense that the expected population size blows up in finite time while the population size remains finite, almost surely, for all time. We find an asymptotic for the almost sure rate of growth of the population.
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the almost sure population growth rate in branching brownian motion with a quadratic breeding potential
arXiv: Probability, 2009Co-Authors: Julien Berestycki, Eric Brunet, J W Harris, Simon R HarrisAbstract:In this note we consider a branching Brownian motion (BBM) on $\mathbb{R}$ in which a particle at Spatial Position $y$ splits into two at rate $\beta y^2$, where $\beta>0$ is a constant. This is a critical breeding rate for BBM in the sense that the expected population size blows up in finite time while the population size remains finite, almost surely, for all time. We find an asymptotic for the almost sure rate of growth of the population.
